/Engine/Source/Developer/TextureFormat/Public/Interfaces/ITextureFormat.h
Extra data for an encoded texture. For "normal" textures (i.e. linear, without a packed mip tail), this must be all zeroes.
struct FEncodedTextureExtendedData
bool
bSensitiveToLODBias
If true, this texture might change layouts if top mips are striped (i.e. LODBias is not zero).
uint32
ExtData
int8
LODBiasIfSensitive
If bSensitiveToLODBias is set, this is the LODBias for this layout.
TArray< uint64,...
MipSizesInBytes
With packing/tiling, mip sizes are not trivially computable.
int32
NumMipsInTail